Cable trench support for electric power engineering

Abstract

The invention provides a cable trench support for electric power engineering. The cable trench support comprises a grooved rail fixedly installed on the inner wall of a cable trench. The grooved rail is used for clamping and installing the supporting frame, and the free end of the supporting frame extends towards the middle of the cable trench to provide suspension support for the cable. The support frame can move along the grooved rail after being adjusted, and can be locked after moving to a required position; the grooved rails are arranged as supporting and guiding parts, the supporting frames with the corresponding number and positions can be installed according to requirements, use of hole sites can be reduced, the positions of the supporting frames can be flexibly adjusted, and use is convenient.

Description

Technical Field

[0001] The present invention relates to the field of cable laying, and more specifically to a cable trench support for electric power engineering. Background Art

[0002] The cable trench bracket is a frame installed in the cable trench to support the cable. The design and construction of the corresponding laying density are based on the cable support requirements. Although it is a relatively mature mechanical structure, it still has certain defects. For example, most conventional brackets are installed on the inner wall of the cable trench by expansion bolts. It is a fixed installation structure, which is not convenient for changing the position and has poor flexibility. In addition, for the high-density laying requirements, each bracket needs to drill a group of holes, which may damage the concrete structure of the cable trench itself and is not convenient for actual use. Therefore, it needs to be improved. Summary of the invention

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a cable trench bracket for power engineering, in which a groove rail is provided as a supporting and guiding component, and a corresponding number and position arrangement of support frames can be installed according to needs, which can reduce the use of holes and can also flexibly adjust the position of the support frame for easy use.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] The present invention provides a cable trench support for electric power engineering, comprising a groove rail fixedly mounted on the inner wall of the cable trench; the groove rail is used to clamp and mount a support frame, the free end of the support frame extends toward the middle of the cable trench to provide a suspended support for the cable; the support frame can be moved along the groove rail after adjustment, and can be locked after moving to a desired position.

[0006] In a preferred technical solution of the present invention, baffles are fixedly provided on both sides of the groove of the groove rail; the support frame includes a frame rod and a top support assembly; a clamp is fixedly provided at one end of the frame rod, the clamp is a rectangular structure, and the two end surfaces are arc-shaped structures; the width of the clamp is adapted to the spacing between the two baffles, and the length of the clamp is adapted to the spacing between the two groove inner walls of the groove rail; the top support assembly is installed on the frame rod, and the top tongue of the top support assembly passes through the wall surface of the clamp away from the center of the frame rod and provides an elastic support effect; the horizontally placed clamp extends into the interior of the groove rail from between the two baffles; the two ends of the clamp that is rotated to the vertical position respectively abut against the two groove inner walls of the groove rail; the top support assembly provides an elastic force toward the center side of the frame rod, so that the clamp is pressed against the baffle.

[0007] In a preferred technical solution of the present invention, the inner wall of the baffle bar is fixedly provided with a first latch tooth arranged in an array along the length direction of the baffle bar; the two ends of the wall surface of the clamping head close to the frame rod are fixedly provided with a second latch tooth, and the shape of the second latch tooth is adapted to the shape of the first latch tooth; the top support assembly provides a thrust for the clamping head extending into the groove rail, so that the second latch tooth engages and locks with the first latch tooth.

[0008] In a preferred technical solution of the present invention, the top support assembly includes a top tongue, a first spring, and a pin; a guide hole is provided in the middle of the end surface of the clamp away from the frame rod, and the diameter of the guide hole is adapted to the diameter of the top tongue; the end side wall of the frame rod is provided with a strip opening passing through the guide hole, and the strip opening extends along the length direction of the frame rod; the pin is installed on the top tongue, and the pin passing through the side wall of the top tongue extends into the strip opening to prevent the top tongue from completely detaching from the guide hole; the first spring is arranged in the guide hole to provide an elastic force for the top tongue to push outward.

[0009] In a preferred technical solution of the present invention, support blocks are fixedly provided on both sides of the outer wall of the frame rod close to the clamping head, the support blocks are arranged corresponding to the long side walls of the clamping head, and the strip-shaped openings correspond to the outer wall surfaces passing through the support blocks; a placeholder kit is sleeved on the end of the frame rod, the placeholder kit is sleeved on the outer sides of the two support blocks, and moves along the outer walls of the support blocks toward the length direction of the frame rod; protrusions are provided on both sides of the placeholder kit corresponding to the groove openings of the groove rail, and the vertical length of the protrusions is adapted to the spacing between the two baffles; a first magnet block and a second magnet block are fixedly embedded on the top surface of the support block, the first magnet block is located at the end away from the clamping head, and a third magnet block is correspondingly embedded on the placeholder kit; when the placeholder kit moves to the point where the third magnet block and the first magnet block are magnetically attracted, the protrusion is separated from the baffle and is located on the outer side of the groove rail; when the placeholder kit moves to the point where the third magnet block and the second magnet block are magnetically attracted, the protrusion is stuck between the two baffles, used to limit the frame rod to move only along the groove rail.

[0010] In a preferred technical solution of the present invention, a retaining ring is fixedly provided on the side wall of one end of the frame rod close to the guide hole, and the retaining ring is connected to the end of the support block away from the clamping head; a plurality of grooves distributed in an array around the center circumference are provided on the wall surface of the retaining ring away from the clamping head; a plurality of ridges extending along the axial direction are fixedly provided on the outer wall of the frame rod on the side of the retaining ring away from the clamping head, and the plurality of ridges are distributed in an array around the center circumference of the frame rod.

[0011] In a preferred technical solution of the present invention, a limit assembly is installed on the retaining ring, and the limit assembly is used to provide limited resistance to the rotation of the rack rod, so that the long side wall of the chuck rotates to a horizontal position.

[0012] In a preferred technical solution of the present invention, an extension plate is fixedly provided on one side of the top of the retaining ring, and the extension plate extends in a direction deviating 45° from the central plane of the chuck; a first through hole and a second through hole are provided through the extension plate, and the first through hole is located at the far end position; the limiting component includes a pressing plate and a second spring; a first guide rod and a second guide rod are fixedly provided on one wall surface of the pressing plate, and the positions of the first guide rod and the second guide rod correspond to the positions of the first through hole and the second through hole respectively, and the first guide rod and the second guide rod correspondingly penetrate through the first through hole and the second through hole; a sinking groove is provided outside the port of the first through hole away from the chuck, the second spring is sleeved outside the first guide rod, and the second spring is arranged in the sinking groove to provide an elastic force for pushing the pressing plate outwards; a snap spring is provided on the first guide rod to prevent detachment; the outer wall of the first guide rod is tangent to the outer wall surface of the groove rail; when only the retaining ring is pushed to the chuck against the bottom of the groove rail, there is still a gap between the first guide rod and the second guide rod and the groove rail; when the pressing plate and the retaining ring are simultaneously pushed to the chuck against the bottom of the groove rail, there is a gap between the second guide rod and the groove rail, and the first guide rod extends to abut against the groove wall of the groove rail.

[0013] The beneficial effects of the present invention are as follows:

[0014] A cable trench support for electric power engineering provided by the present invention includes a groove rail fixedly installed on the inner wall of the cable trench; the groove rail is used for clamping and installing a support frame, and the free end of the support frame extends towards the middle of the cable trench to provide a suspended support for the cable. The number of support frames can be increased or decreased according to needs, which can not only meet the support strength and range, but also has high flexibility. Moreover, there is no need to drill holes for each support frame for installation, which is convenient for actual operation and construction.

[0015] Furthermore, the support frame can be adjusted to move along the groove rail and can be locked after moving to the required position. The spacing range can be adjusted according to needs, and it can also move and change positions in two butt-jointed groove rails. It is also convenient to set positions that are not convenient to directly install by means of horizontal movement, which can further enhance the flexibility of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of a cable trench support for electric power engineering provided in a specific embodiment of the present invention;

[0017] Figure 2 is Figure 1 an enlarged view of part A in

[0018] Figure 3 is a three-dimensional structural schematic diagram of the support frame provided in a specific embodiment of the present invention;

[0019] Figure 4 is a three-dimensional unfolded structural schematic diagram of the support frame provided in a specific embodiment of the present invention from the first perspective;

[0020] Figure 5 It is a schematic diagram of the three-dimensional unfolded structure of the second perspective of the support frame provided in the specific embodiment of the present invention;

[0021] Figure 6 It is a schematic diagram of the three-dimensional unfolded structure of the third perspective of the support frame provided in the specific embodiment of the present invention;

[0022] Figure 7 It is a schematic diagram of the use state of a cable trench support for a power project provided in the specific embodiment of the present invention.

[0023] In the figure:

[0024] 100, groove rail; 110, retaining strip; 120, first tooth;

[0025] 200, support frame; 210, frame rod; 211, chuck; 212, second tooth; 213, guiding hole; 214, strip-shaped opening; 215, support block; 216, first magnet block; 217, second magnet block; 218, convex rib; 220, top support assembly; 221, top tongue; 222, first spring; 223, pin shaft;

[0026] 230, occupancy kit; 231, convex block; 232, third magnet block;

[0027] 240, retaining ring; 241, groove; 242, extension plate; 243, first through hole; 244, second through hole; 245, sinking groove; 250, limiting assembly; 251, pressing plate; 252, second spring; 253, first guiding rod; 254, second guiding rod. Specific embodiments

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments.

[0029] As Figure 1 shown, a cable trench support for a power project is disclosed in the specific embodiment of the present invention, including a groove rail 100 fixedly installed on the inner wall of the cable trench; the groove rail 100 is used for clamping and installing the support frame 200, and the free end of the support frame extends towards the middle of the cable trench to provide a suspended support for the cable; the support frame can be adjusted to move along the groove rail and can be locked after moving to the required position.

[0030] For the above-mentioned cable trench support for a power project, the number of support frames can be increased or decreased according to requirements, which can not only meet the support strength and range, with high flexibility, but also does not require drilling and installing for each support frame, facilitating actual operation and construction;

[0031] In addition, the support frame can be adjusted to move along the groove rail, and can be locked after moving to the desired position. The spacing range can be adjusted according to needs, and it can also be moved and replaced in two butted groove rails. It is also convenient to set some positions that are not convenient for direct installation by lateral movement, which can further enhance the flexibility of use; It should be noted that if Figure 7 As shown, the layout of the groove rails needs to be designed according to the actual cable wiring needs. It can be designed in a variety of ways, such as single-layer distribution, multi-layer distribution, staggered distribution, end-to-end connection, partial overlap, etc., and can be selected and arranged according to specific actual needs.

[0032] Furthermore, if Figures 2 to 4 As shown, both sides of the slot of the groove rail 100 are fixed with baffles 110; the support frame 200 includes a frame rod 210 and a top support assembly 220; a clamping head 211 is fixedly provided at one end of the frame rod 210, and the clamping head is a rectangular structure, and the two end surfaces are arc-shaped surface structures; the width of the clamping head 211 is adapted to the distance between the two baffles 110, and the length of the clamping head 211 is adapted to the distance between the two groove inner walls of the groove rail 100; the baffle is arranged at the slot of the groove rail to form a narrowing mouth, and the shape of the clamping head can be matched to realize the detachable and non-detachable action by rotating the direction of the clamping head, providing basic conditions for fixing the support frame on the groove rail;

[0033] The top support assembly 220 is installed on the rack rod 210. The top tongue 221 of the top support assembly 220 passes through the wall of the clamp head 211 away from the center of the rack rod 210 and provides an elastic support effect; the horizontally placed clamp head extends into the groove rail from between the two stop bars;

[0034] The two ends of the clamp head that rotates and swings vertically are respectively abutted against the two inner walls of the groove of the groove rail; the supporting assembly provides elastic force to the center side of the frame rod, so that the clamp head is pressed against the stop bar; the overall structure and principle are relatively simple, and the stop bar limits the opening of the groove of the groove rail and provides a force-blocking part, especially the supporting assembly is provided, when the push tongue is blocked from pushing outward, the force is naturally transferred to the frame rod, and the push frame rod is pushed toward the groove of the groove rail, so that the clamp head is abutted against the stop bar, thereby playing the effect of strengthening support and preventing loosening;

[0035] Furthermore, if Figure 2 As shown, the inner wall of the barrier bar 110 is fixedly provided with first latch teeth 120 arranged in an array along the length direction of the barrier bar; Figure 4As shown, second teeth 212 are fixedly provided at both ends of the wall surface of the clamping head 211 close to the frame rod 210, and the shape of the second teeth 212 is adapted to the shape of the first teeth 120; the top support assembly provides thrust for the clamping head extending into the groove rail, so that the second teeth engage and lock with the first teeth; this structural design can provide a barrier in the length direction of the baffle for the clamping head after it is installed in place, so that it cannot move left and right; the two ends of the clamping head are also restricted by the two inner walls of the groove rail and cannot move up and down, and naturally cannot rotate, thereby achieving a locking effect.

[0036] Furthermore, if Figures 3 to 6 As shown, the supporting assembly 220 includes a tongue 221, a first spring 222, and a pin 223; a guide hole 213 is provided in the middle of the end surface of the clamp head 211 away from the frame rod, and the diameter of the guide hole 213 is adapted to the diameter of the tongue 221; the side wall of the end of the frame rod 210 is provided with a strip opening 214 that passes through the guide hole 213, and the strip opening extends along the length direction of the frame rod; the pin 223 is installed on the tongue 221, and the pin 223 that passes through the side wall of the tongue 221 extends into the strip opening 214 to prevent the tongue from completely escaping from the guide hole; the first spring 222 is arranged in the guide hole 213 to provide an elastic force for the tongue to push outward; its overall structure is simple and is an assembled structure, which can facilitate the processing and production of various structural components and the overall assembly; the tongue is supported by the first spring to push outward, and when the movement of the tongue is blocked, it provides a directional elastic force for the frame rod, so that the second clamping tooth and the first clamping tooth maintain a meshing and locking state.

[0037] Further, on both sides of the outer wall of the support rod 210 near the chuck, support blocks 215 are fixedly provided. The support blocks 215 are arranged corresponding to the long side side walls of the chuck 211, and the strip-shaped openings penetrate through the outer wall surfaces of the support blocks correspondingly; a positioning kit 230 is sleeved on the end of the support rod 210. The positioning kit 230 is sleeved on the outside of the two support blocks 215 and moves along the outer wall of the support block in the length direction of the support rod; on both sides of the positioning kit 230, bumps 231 are provided corresponding to the slots of the slot track 100. The vertical length of the bumps 231 is adapted to the distance between the two stop strips 110; on the top surface of the support block 215, a first magnet block 216 and a second magnet block 217 are fixedly embedded. The first magnet block is located at the end far from the chuck. A third magnet block 232 is correspondingly embedded on the positioning kit 230; when the positioning kit moves to the position where the third magnet block is magnetically attracted to the first magnet block, the bump disengages from the stop strip and is located outside the slot track; when the positioning kit moves to the position where the third magnet block is magnetically attracted to the second magnet block, the bump is clamped between the two stop strips, which is used to limit that the support rod can only move along the slot track; this structural design can achieve the effect of secondary limitation through the positioning kit. Especially when it is necessary to horizontally adjust and move the support frame, the bump extends between the two stop strips. When the support rod is pushed inward until the chuck abuts against the bottom of the slot of the slot track, even if the chuck disengages from the meshing and locking part at this time, the bump still remains clamped between the two stop strips. Limited by the interference between the bump and the stop strip, the entire support frame cannot rotate and can only move along the length direction of the slot track, which is convenient for actual adjustment and use;

[0038] Further, on the side wall of one end of the support rod 210 near the guiding hole 213, a retaining ring 240 is fixedly provided. The retaining ring is connected to the end of the support block far from the chuck; on the wall surface of the retaining ring 240 far from the chuck 211, a plurality of grooves 241 are provided, which are distributed in a circumferential array around the center; on the outer wall of the support rod 210 on the side of the retaining ring 240 far from the chuck 211, a plurality of convex ribs 218 extending along the axial direction are fixedly provided. The plurality of convex ribs are distributed in a circumferential array around the center of the support rod; by setting the retaining ring as the force-receiving part for pushing the entire support rod, the groove part can be used as the part where the finger extends, so as to provide the force application in the rotation direction. The convex ribs can also enhance the overall friction force, which is convenient for rotating and adjusting the support rod;

[0039] Among them, the positioning kit includes two relatively arranged chutes. The chutes are slidably arranged on the outside of the support block. A frame bar is erected between the top and the bottom of the two chutes. The frame bar is connected to the chutes by screws. The bumps are fixedly arranged at the end face of the chute close to the slot track. The whole is an assembled structure, which can facilitate the processing and production of each structural component and is also convenient for installing it on the support rod so that it is slidably arranged between the chuck and the retaining ring.

[0040] Further, a limiting component 250 is installed on the retaining ring 240. The limiting component is used to provide a limiting block for the rotation of the support rod, so that the long side wall of the chuck rotates to the horizontal position. Through the defined structure, it is convenient for the chuck to quickly swing to the horizontal position when the support frame is removed, so as to be quickly pulled out and detached.

[0041] Further, an extension plate 242 is fixedly provided on one side of the top of the retaining ring 240. The extension plate extends along a direction deviating 45° from the central plane of the chuck. A first through hole 243 and a second through hole 244 are penetrated through the extension plate 242. The first through hole is located at the farther end position.

[0042] The limiting component 250 includes a pressing plate 251 and a second spring 252. A first guide rod 253 and a second guide rod 254 are fixedly provided on one wall surface of the pressing plate 251. The positions of the first guide rod and the second guide rod correspond to the positions of the first through hole and the second through hole respectively. The first guide rod and the second guide rod correspondingly penetrate through the first through hole and the second through hole. A sink 245 is provided outside the port of the first through hole 243 away from the chuck. The second spring 252 is sleeved outside the first guide rod 253. The second spring 252 is arranged in the sink 245 to provide an elastic force for pushing the pressing plate outwards. A snap ring is provided on the first guide rod to prevent detachment. The outer wall of the first guide rod 253 is tangent to the outer wall surface of the groove rail 100. When only the retaining ring is pushed until the chuck abuts against the bottom of the groove rail, there is still a gap between the first guide rod and the second guide rod and the groove rail. When the pressing plate and the retaining ring are simultaneously pushed until the chuck abuts against the bottom of the groove rail, there is a gap between the second guide rod and the groove rail, and the first guide rod extends to abut against the groove wall of the groove rail. The above structural design can enable quick alignment when the support frame needs to be detached, facilitating removal. More specifically, during removal, hold the hand on the position of the support rod close to the retaining ring, push the support rod and the pressing plate towards the groove rail simultaneously until the movement is blocked, and then rotate until the first guide rod swings to abut against the other side of the groove rail. At this time, the chuck is placed in the horizontal position, and pulling out the support rod outward can complete the removal.

[0043] Further, a chamfer is provided on the edge of the end of the first guide rod, which is convenient for the first guide rod to smoothly move to abut against the outer wall of the groove rail, so as to perform effective limitation and alignment and facilitate the removal of the chuck.

[0044] Further, two opposite cutting grooves are provided on the outer wall of the support rod. The positions of the cutting grooves correspond to the end faces of the chucks. When the second teeth are engaged with the first teeth, the cutting grooves are in the plane position to support the cable and prevent the cable from slipping easily.

[0045] The present invention is described by way of preferred embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A cable trench support for electric power engineering, characterized in that: It includes a groove rail fixedly installed on the inner wall of the cable trench; The groove rail is used to clamp and install the support frame, and the free end of the support frame extends to the middle of the cable trench to provide a suspended support for the cable; The support frame can be moved along the groove rail after being adjusted, and can be locked after being moved to a desired position.

2. A cable trench support for electric power engineering according to claim 1, characterized in that: Stop bars are fixedly provided on both sides of the groove of the groove rail; The support frame includes a frame rod and a top support assembly; A clamp is fixedly provided at one end of the rack rod. The clamp is a rectangular structure, and both end surfaces are arc-shaped structures. The width of the clamp is adapted to the spacing between the two baffles, and the length of the clamp is adapted to the spacing between the two inner walls of the groove of the groove rail. The top support assembly is installed on the rack rod, and the top tongue of the top support assembly passes through the wall surface of the clamping head away from the center of the rack rod and provides an elastic support effect; The horizontally placed clamping head extends into the groove rail from between the two baffle bars; The two ends of the clamping head that rotates and swings vertically are respectively abutted against the two inner walls of the groove of the groove rail; the top support assembly provides elastic force toward the center side for the frame rod, so that the clamping head is pressed against the stop bar.

3. A cable trench support for electric power engineering according to claim 2, characterized in that: The inner wall of the barrier bar is fixedly provided with first latching teeth arranged in an array along the length direction of the barrier bar; The two ends of the wall surface of the clamp head close to the frame rod are fixed with second clamping teeth, and the shape of the second clamping teeth is adapted to the shape of the first clamping teeth; The supporting assembly provides a thrust for the clamping head extending into the groove rail, so that the second clamping teeth are meshed and locked with the first clamping teeth.

4. A cable trench support for electric power engineering according to claim 3, characterized in that: The top support assembly includes a top tongue, a first spring, and a pin shaft; A guide hole is provided in the middle of the end surface of the clamp away from the rack rod, and the diameter of the guide hole is adapted to the diameter of the top tongue; The end side wall of the rack rod is provided with a strip opening penetrating the guide hole, and the strip opening extends along the length direction of the rack rod; The pin is installed on the top tongue, and the pin passes through the side wall of the top tongue and extends into the strip-shaped opening to prevent the top tongue from completely leaving the guide hole; The first spring is arranged in the guide hole to provide elastic force for the tongue to push outward.

5. A cable trench support for electric power engineering according to claim 4, characterized in that: Support blocks are fixedly arranged on both sides of the outer wall of the frame rod close to the clamp, the support blocks are arranged corresponding to the long side walls of the clamp, and the strip-shaped openings correspond to the outer wall surfaces that penetrate the support blocks; The end of the rack rod is sleeved with a placeholder kit, which is sleeved on the outside of the two support blocks and moves along the outer wall of the support block toward the length direction of the rack rod; the two sides of the placeholder kit are provided with protrusions corresponding to the grooves of the groove rail, and the vertical length of the protrusion is adapted to the spacing between the two stop bars; A first magnet block and a second magnet block are fixedly embedded on the top surface of the support block, the first magnet block is located at an end away from the clamping head, and a third magnet block is correspondingly embedded on the placeholder kit; When the placeholder kit moves to the point where the third magnet block is magnetically attracted to the first magnet block, the protrusion is separated from the stop bar and is located outside the groove rail; When the placeholder kit moves to the point where the third magnet block and the second magnet block are magnetically attracted, the protrusion is stuck between the two stop bars to limit the rack rod to move only along the groove rail.

6. A cable trench support for electric power engineering according to claim 5, characterized in that: One end side wall of the support rod close to the guiding hole is fixedly provided with a retaining ring, and the retaining ring is connected to one end of the support block away from the chuck; A plurality of grooves are arranged on the wall surface of the retaining ring away from the chuck and are distributed in a circumferential array around the center; On the outer wall of the support rod on the side of the retaining ring away from the chuck, a plurality of convex ribs extending along the axial direction are fixedly provided, and the plurality of convex ribs are distributed in a circumferential array around the center of the support rod.

7. A cable trench support for electric power engineering according to claim 6, wherein: A limiting component is installed on the retaining ring, and the limiting component is used to provide a limiting block for the rotation of the support rod, so that the long side wall of the chuck rotates to the horizontal position.

8. A cable trench support for electric power engineering according to claim 7, wherein: One side of the top of the retaining ring is fixedly provided with an extension plate, and the extension plate extends along the direction deviating from the central plane of the chuck by 45°; a first through hole and a second through hole are penetrated through the extension plate, and the first through hole is located at the farther end position; The limiting component includes a pressing plate and a second spring; A first guiding rod and a second guiding rod are fixedly provided on one wall surface of the pressing plate, and the positions of the first guiding rod and the second guiding rod correspond to the positions of the first through hole and the second through hole respectively, and the first guiding rod and the second guiding rod correspondingly penetrate through the first through hole and the second through hole; A sink is arranged outside the port of the first through hole away from the chuck, the second spring is sleeved outside the first guiding rod, and the second spring is arranged in the sink to provide an elastic force for pushing the pressing plate outwards; a snap ring for preventing detachment is arranged on the first guiding rod; The outer wall of the first guiding rod is tangent to the outer wall surface of the groove track; When only the retaining ring is pushed until the chuck abuts against the bottom of the groove track, there is still a gap between the first guiding rod and the second guiding rod and the groove track; When the pressing plate and the retaining ring are simultaneously pushed until the chuck abuts against the bottom of the groove track, there is a gap between the second guiding rod and the groove track, and the first guiding rod extends to abut against the groove wall of the groove track.

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